> From: Richard Biener [mailto:rguent...@suse.de] > Sent: Monday, December 29, 2014 5:09 PM > > OK, but what about targets without a rotation optab? Is the fallback > expansion reasonable in all cases?
To be honest I haven't checked. I thought being a treecode means it can always be expanded, using a sequence of shift and bitwise or if necessary. Isn't there some language that GCC support with rotate operators? Given your question I guess I was wrong assuming this. Is there a list of gimple construct that are necessary supported? What about a list of insn pattern that a backend must necessarily provide? Best regards, Thomas
